What kind of material is the lighthouse of Alexandria made out of?

Mount kosciuszko is the highest point and lake Eyre the lowest point on which continent? Where Mt Whitney national park located? What opened new shipping routes by connecting many lakes and rivers? Greek citizens assembled in an open area called an? Is K2 a folded mountain or fault block? Does the Black Sea have minerals? What is the Grand Canyon classified as? Why can't routers forward packets as quickly as bridges can? What building materials were used to make Windsor Castle? What does mount fuji look like in summer? Can you ride hoverboards on the beach? Where does the ganges river originate? Sea which is partly enclosed by land? What was the largest mountain before mount Everest? How are lakes different from ponds? How far is Lincoln memorial from the white house? Is 285 too big to ride roller coasters? How long is the Yarra River in Melbourne? What 3 continents can be seen from the rock of Gibraltar? What are the intertidal and neritic and open-ocean zones?